516
Chapter 31 External Bus
2.External Bus Interface Registers
ASZ3-0 are used to set the size of each area by modifying the number of bits for address comparison to a value
different from ASR. Thus, an ASR contains bits that are not compared. Bits ASZ3-0 of ACR0 are initialized to
1111
B
(0F
H
) by RST. Despite this setting, however, the CS0 area just after RST is executed is specially set from
00000000
H
to FFFFFFFF
H
(setting of entire area). The entire-area setting is reset after the first write to ACR0
and an appropriate size is set as indicated in
Table 2-1
"Area Size Settings".
[Bits 11-10] DBW1-0 (Data Bus Width 1-0)
These bits set the data bus width of each chip select area as indicated in
Table 2-2
"Setting of the Data Bus
Width of Each Chip Select Area":
The same values as those of the WTH bits of the mode vector are written automatically to bits DBW1-0 of ACR0
during the reset sequence.
[Bits 9-8] BST1-0 (Burst Size 1-0)
These bits set the maximum burst length of each chip select area as indicated in
Table 2-3
"Setting of the
Maximum Burst Length of Each Chip Select".
0
1
1
1
8 MB (00800000
H
byte, ASR A[31:23] bits are valid)
1
0
0
0
16 MB (01000000
H
byte, ASR A[31:24] bits are valid)
1
0
0
1
32 MB (02000000
H
byte, ASR A[31:25] bits are valid)
1
0
1
0
64 MB (04000000
H
byte, ASR A[31:26] bits are valid)
1
0
1
1
128 MB (08000000
H
byte, ASR A[31:27] bits are valid)
1
1
0
0
256 MB (10000000
H
byte, ASR A[31:28] bits are valid)
1
1
0
1
512 MB (20000000
H
byte, ASR A[31:29] bits are valid)
1
1
1
0
1024 MB (40000000
H
byte, ASR A[31:30] bits are valid)
1
1
1
1
2048 MB (80000000
H
byte, ASR A[31] bit is valid)
Table 2-2 Setting of the Data Bus Width of Each Chip Select Area
DBW1
DBW0
Data bus width
0
0
8 bits (byte access)
0
1
16 bits (halfword access)
1
0
32 bits (word access)
1
1
Reserved Setting disabled
Table 2-3 Setting of the Maximum Burst Length of Each Chip Select
BST1
BST0
Maximum burst length
0
0
1 (single access)
0
1
2 bursts (address boundary: 1 bit)
Table 2-1 Area Size Settings
ASZ3
ASZ2
ASZ1
ASZ0
Size of each chip select area
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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